number of preparations in a multiple assay,including the Standard and h Unknowns; i.e.,h¢ = h + 1.

i

interval in logarithms between successivelog-doses, the same for both Standardand Unknown.

k

number of estimated log-potencies in an average[Equation 24]; number of treatments or doses[Table 4; Equations 1, 13, 15, 16]; number ofranges or groups in a series [Table 2]; number of rows, columns, and doses in a single Latin square [Equations 1a, 16a].

L

length of the confidence interval in logarithms[Equations 24, 26, 29, 38], or in terms of aproportion of the relative potency of the dilutions compared [Equations 31, 33].

Lc

length of a combined confidence interval[Equations 42, 43].

Lc¢

length of confidence interval for a semi-weightedmean bar(M) [Equation 48].

an observed individual response to a dose of drugin the units used in computing potency and theerror variance [Equations 13 to 16]; a unitdifference between paired responses in 2-doseassays [Equations 17, 18].

y1 . . . yN

observed responses listed in order of magnitude,for computing G1, G2, or G3 in Table 1.

y¢

replacement for a missing value [Equation 1].

bar(y)

mean response in a set or assay [Equation 5].

bar(y)t

mean response to a given treatment[Equations 3, 6].

Y

a response predicted from a dosage-responserelationship,often with qualifying subscripts [Equations 3 to 5].